240 



2. E. macrorrhyncha, F.v.M. (Sec E. maprorrhyncha.) 



3. E. Muelleriana, Howitt, (See E. Muelleriana .) 



4. E. piperita, Sm. 



In the " Flora Australiensis " E. eugenioides is reduced to a variety of 

 E. piperita, but it has since been, shown to be an undoubtedly good species, its 

 affinities being more with E. capitellata than with E. piperita. From the latter it 

 is easily distinguished in the living state by the strong fibrous character of the bark 

 which extends to the small branches, the other species having a bark of the texture 

 of E. amygdalina, and being only half-barked in general like E. pilularis. The 

 fruits of E. piperita are more contracted at the top with a thin rim, whereas those 

 of E. eugenioides have a well-marked rim, sometimes flat, but generally raised. The 

 juvenile foliage and timber are also very different. 



Following are the reports on the Stringybark oils dealt with in this Part, 

 taken from Messrs. Baker and Smith's " Research on the Eucalypts." Each form 

 was only subjected to one or at most two distillations : — 



Species. 



Whence 

 obtained. 



Specific 



Gravity at 



13° C. 



Specific 



Rotation 



(a] 



D 



Saponifica- 

 tion 

 Number. 



Solubility 



in 

 Alcohol. 



Constituents found. 



capitelluta, Sin. 



Canterbury, 

 Sydney, 

 N.S.W. 



09175 



+ 4-8° 



4-27 



1 vol. 80% 



Eucalyptol, pinene, 

 phellandrene,* 

 sesquiterpene. 



Muelleriana, Howitt 

 (as E. hevopinea, 

 R. T. Baker). 



Rylstone, 



N.S.W. 



0-8755 



-46-74° 

 (first frac- 

 tion). 



7-0 



Insoluble 



Pinene (kevo-rota- 

 tory). 



Do. (usE. dexlropinea, 

 R. T. Baker). 



Barber's 

 Creek and 

 Currawang 

 Creek, 



N.S.W. 



0-8758 



to 

 0-8778 



+ 38-18° 



to 

 + 39-59° 



22-9 



Insoluble 



Pinene, esters. 



Wilkinsouiaua, R. T. 

 Baker. 



Barber's 



Creek, 



N.S.W. 



0-8944 



-23-9° 



5-0 



Insoluble 



Pinene (Lx'vo-rota- 

 tory), eucalyptol. 



nigra, R. T. Baker... 



Wood burn, 

 N.S.W. 



0-8744 



- 38-88° 



7-2 



Insoluble 



Phellandrene,* 

 eucalyptol. 



macrorrhyncha, 

 F.v.M. 



Rylstone 

 district, 

 N.S.W. 



0=9290 



-1-11° 



(first frac- 

 tion). 



8-36 



1 J vols. 

 70% 



Eucalyptol, pliellan- 

 drene,* eudesmol, 

 pinene. 



eugenioides, Sieb. ... 



Canterbury, 

 Sydney, 

 N.S.W. 



0-9122 



to 

 0-9132 



+ 3-74° 



to 

 + 5-246° 



6-89 



1 vol. 80%, 

 but solu- 

 bility in- 

 creases on 

 keeping. 



Pinene, eucalyptol, 

 sesquiterpene. 



On these figures, E. eapitellata and E. eugenioides are very closely related. 

 I invite attention to the relationships of the other species on the figures given ; they 

 can be discussed in a chemical or pharmaceutical journal. 



This terpenc (phellandrene) alters much, occurring in small quantities in many Eucalyptus oils at certain seasons 

 of the year, while at other times it is absent (H. G. Smith). 



